The Interannual Relationship between the Diabatic Heating over the South Asia and the Snow Depth over the Southern Tibetan Plateau in Late Spring to Early Summer: Roles of the Air Temperature

IF 2.1 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Chengyang Zhang, Zhihai Zheng, Yixiao Ou, Tuantuan Zhang, Zhixiang Xiao, Sheng Lai, Yuexing Cai, Sirong Chen, Weijian Qin, Hui He
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Abstract

The southern Tibetan Plateau (TP) is snow covered during cold season but exhibits faster snow melting in early summer. Using in situ observations and improved satellite-derived data, the present study indicates that the snow depth (SD) over the southern TP exhibits distinction characteristics between late spring (i.e., P1: April 16th–May 15th) and early summer (i.e., P2: May 16th–June 14th). In terms of climate states, the snow melting rate over the southern TP in P2 is faster than that in P1. The acceleration of snow melting during P2 is mainly found over high elevation areas caused by the increase of local air temperature. Diagnoses of the thermodynamic equation further demonstrate that the warming over the southern TP during the two periods is mainly attributed to the meridional temperature advection and diabatic heating in situ. On the interannual time scale, the SD over the southern TP is closely related to diabatic heating over South Asia. During P1, the diabatic cooling from the southern Bay of Bengal eastward to the western South China Sea suppresses convection over the Bay of Bengal and southern TP and has resulted in an upper-level anomalous cyclone and cold temperature anomalies from the surface to 200 hPa over the southern TP, favoring the above-normal SD over the southern TP. On the other hand, SD over the southern TP in P2 is closely related to diabatic cooling over the northern Indochina Peninsula and diabatic heating over the southern China. But we could not prove that these diabatic heating anomalies can affect the SD over the southern TP by modulating local surface air temperature. This may be limited by the quality of the data and the simulation capability of the simple model.
春末夏初南亚非绝热加热与青藏高原南部积雪深度的年际关系:气温的作用
青藏高原南部在寒冷季节被雪覆盖,但在初夏雪融化速度更快。利用现场观测和改进的卫星数据,本研究表明,TP南部的雪深(SD)表现出春末(即P1:4月16日至5月15日)和初夏(即P2:5月16日–6月14日)之间的区别特征。从气候状态来看,P2的TP南部融雪速度快于P1。P2期间融雪加速主要发生在高海拔地区,这是由当地气温升高引起的。热力学方程的诊断进一步表明,这两个时期TP南部的变暖主要归因于经向温度平流和非绝热加热。在年际时间尺度上,TP南部的SD与南亚的非绝热加热密切相关。在P1期间,从孟加拉湾南部向东到南海西部的非绝热冷却抑制了孟加拉湾和TP南部的对流,并导致了一个高层异常气旋和从表面到200的低温异常 hPa高于TP南部,有利于高于正常SD的TP南部。另一方面,P2中TP南部的SD与中南半岛北部的非绝热降温和中国南部的非绝热加热密切相关。但我们无法证明这些非绝热加热异常可以通过调节当地地表气温来影响TP南部的SD。这可能受到数据质量和简单模型的模拟能力的限制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Advances in Meteorology
Advances in Meteorology 地学天文-气象与大气科学
CiteScore
5.30
自引率
3.40%
发文量
80
审稿时长
>12 weeks
期刊介绍: Advances in Meteorology is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles in all areas of meteorology and climatology. Topics covered include, but are not limited to, forecasting techniques and applications, meteorological modeling, data analysis, atmospheric chemistry and physics, climate change, satellite meteorology, marine meteorology, and forest meteorology.
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